Safety belt devices



Aug. 24, 1965 G. H. JANTZEN SAFETY BELT DEVICES 5 Sheets-Sheet 1 Filed May 20, 1965 6 ATTORNEYS Aug. 24, 1965 H, JANTZEN 3,201,840

SAFETY BELT DEVICES Filed May 20 1963 3 Sheets-Sheet 2 III/[11114 11/1/011117/1705 INVENTOR. gay/e65 J4 rzz-w ATTORNEYS 1965 G. H. JANTZEN 3,201,840

SAFETY BELT DEVICES Filed May 20, 1965 3 Sheets-Sheet 5 INVENTOR. Gav/F 5 4 JZ'W 7"ZE/V ATTORNEY 3,201,840 SAFETY BELT DEVICES George H. Jantzen, New York, N.Y., assignor to M. Steinthal & Co., Inc., New York, N.Y., a corporation of New York Filed May 20, 1963, Ser. No. 282,537 6 Claims. (Cl. 24-230) The present invention relates to safety belt devices for use in any field where such belt devices may be desirable,

I as for example in aircrafts, or for the front seats of motor vehicles.

Objects of the present invention are to provide a new and improved safety belt device, (1) which is constructed to resist maximum of pulling stresses with a minimum size device, (2) which can be releasably locked to the waist of a wearer by a simple latching operation of a buckle forming part of said device, (3) which requires simultaneous dual finger manipulations of the buckle to effect release of said buckle, so that the incidence of accidental release is eliminated or at least substantially reduced, (4) which is constructed to distribute stresses across the loaded belt in a manner to eliminate or at least materially reduce the possibility of tearing the belt at the sides or edges, (5) which can be adjusted by adjustments of the belt webs on opposite sides of the buckle in a manner to permit the buckle to be maintained centered on the body of the wearer, and (6) which is constructed to allow the belt to be easily removed from the buckle to permit said buckle to be replaced, repaired or cleaned without destroying or breaking any seams in the belt.

Various other objects of the invention are apparent from the following description and from the accompanying drawings, in which FIG. 1 is a front outer view of the safety belt device of the present invention on an enlarged scale, and shows the buckle locked and the cover and frame parts of the buckle broken away to reveal the internal structure of the device;

FIG. 2 shows a front outer view of the safety belt device of FIG. 1 after the buckle has been manipulated into released position and shows some of the cover and frame parts of the buckle removed to disclose the interior structure of the device;

FIG. 3 is an exploded perspective view of one of the buckle parts constituting an embodiment of the present invention;

FIGS. 4, 5 and 6 are sections of the buckle taken approximately on lines 44, 5--5 and 66 respectively ofFIG. 1, but shown on different scales;

FIG. 7 shows a plan view of a bracket and floor fitting which can be employed to attach the belt to the floor of a vehicle;

FIG. 8 is a section of the bracket and floor fitting taken on lines 88 of FIG. 7 and shows the belt threaded to the bracket;

FIG. 9 is a perspective showing the manner in which the belt web can be lengthened on a buckle part; and FIG. 10 is a perspective showing the manner in which the belt web can be manipulated while the buckle is locked to tighten the belt or center the buckle.

Referring to the drawings, the safety belt device comprises generally two separate belt webs 16 and 11, adjustably connected to buckle parts 12 and 13 respectively adapted to be releasably locked together to form a buckle United States Patent 0 14 by which said webs may be connected together. The ends of the belt webs 19 and 11 are connected to respective brackets 15 (FIGS. 7 and 8), which in turn are releasably attached to respective fittings 16 on the floor A of a motor vehicle on opposite sides of a front seat or on the floor of an airplane, or on any anchor site where the safety belt could be used.

The buckle part 12 constituting the male part of the buckle 14 comprises a flat substantially rectangular frame ring 20 having opposed end bar pieces 21 and 22 and opposed side bar pieces 23 and 24 integrally interconnected to form the one piece frame ring and defining therebetween a substantially rectangular oblong opening 25 to receive the belt web 10 in a manner to be described. Integral with the inner or front end bar piece 21 are two symmetrically arranged catches 26 in the form of hook teeth separated by a center rectangular recess 27. Each catch tooth 26 has a wing or extension 28 at its outer side separated from the outer edge of the bar piece 21 by a recess 30 serving as a crook to receive a spring-pressed slide latch bolt 31 on the buckle part 13 in locked position of the buckle 14-, as will be described more fully hereinafter, and a bevelled edge 32 on one corner serving as a cam edge to move said latch bolt out of the way, as the buckle part 12 is inserted into the buckle part 13 in the process of locking the two buckle parts 12 and 13 together. To facilitate the entry of the springpressed latch bolts 31 into the recesses 30 during the locking of the buckle parts 12 and 13 together, the rear edge 33 of each tooth slants slightly rearwardly towards the longitudinal center of the buckle part 12, to taper the recess 30 towards the center of the buckle part, as for example, about 2. With this tapering construction of the recess 30, the entry ends thereof are slightly wider than the width of the latch bolts 31, to ease entry of the bolts therein, while the base ends of the recesses are wide enough to snugly receive the bolts in fully locked position of the buckle 14.

The other buckle part 13 constituting the female part of the buckle 14, comprises a flat substantially rectangular frame ring 35 similar in shape and size to the frame ring 20 and having opposed end bar pieces 36 and 37 and opposed side bar pieces 38 and 4t integrally interconnected to form the one piece frame ring and defining therebetween a substantially rectangular oblong opening 41 to receive the belt web 11 in a manner to be described. Integral with the outer end bar piece 36 is a projecting center piece formed to define a center tooth or tongue 43 serving as a support for the catch teeth 26 when meshing therewith in locked position of the buckle 14 and having a width slightly smaller than the width of the recess 27 to permit the tooth to fit in said recess with a snug slide fit. Also, the length of the catch supporting tooth 43 is substantially the same as the depth of the recess 27, so that the tooth 43 and the catch teeth 26 will intermesh into conforming engagement along the front and inner sides of the catch teeth in locked position of the buckle 14, as shown in FIG. 1.

The catch supporting tooth 43 has integral therewith side ears 5t) spaced from the front edge of the bar piece 36 by recesses 51 to receive one end of coil springs 52 bearing at the other ends against finger levers 5-3, operable by finger manipulation to slide the latch bolts 31 into buckle releasing position, as will be described more fully.

To support and confine the movable operative elements of the buckle part 13 and to form a guide or sockaction of said springs to release said latch bolts 3 et for the other buckle part 12 durin the movement of the buckle parts 12 and 13 into locked position, there are provided two flat frame plates 55 and 56 substantially of rectangular oblong shape, rigidly secured to the forward end ofv the frame ring 35 on opposite faces thereof in facially confronting registered relationship by means of press-fitted or peened pins or rivets 57 passing through said plates and through the ring in the regions of the bar piece 36 and thelcatch supporting tooth 43. I The distance between the frame plates 55. and 56 is slightly greater than the thickness of the catch teeth 26, to permit said teeth to-be inserted between said plates with a free slide fit, when the buckle parts 12 and 13 are brought together to lock them. 7

Each of the frame plates 55 and 56 has two openings 58 elongated in a direction cross-wise of the buckle 14,

correspondingly curved edge'63of theend of thelatchbolt 31, as will be more fully described. The openings 58 in the two frame plates 55 and 56 are in registry;

the slide 76, the levers 53a-re prevented from being operated separately, thereby assuring against accidental release of the buckle 14 by the accidental turning of only one lever. a

To decoratively conceal the frame plates 55 and 56 and the structures supported thereby, and to confine the slide 76 against the plate 55 in straddling position, there are provided two'covers 82 and 83 of substantially oblong rectangular shape corresponding to the shape of these plates and having rirns 84 and 85 respectively around the edges. These covers 82' and 83 are fitted snugly over the plates 55 .and 56 respectively and are secured thereto by crimping the rims 84' and 85 into notches 86 on the edges of said plates. The front cover 82 fitsover the slide 76 and is deeper than the cover 83 to provide a clearance 86 between the base wall 87 of the cover 82 and the outer face of the plate 55 for the slide 7 6,-as shown in FIGS. 4

' 3 frame platep To support'the coil springs 52 againstexcessivebuckr' ling while the buckle parts 12 and :13 are being manipulated for release, and to confine the springs against accidental displacement, each of the frame plates 55,.and 56 is depressed in two regions thereof toform two projections 65 meeting the projections 65-similarly formed on the other frame plate to conjointly form abutments for the intermediate sections of the springs when de-;

frame plates 55 and 56, each of these frame plates has two holes 66 serving as hearing for two pivot pins secured to the finger levers 55.

Each of the finger levers 53 fits between the two frame '7 plates 55 and 56 with easy rotative fit and isin the form of a bell crank having-one arm 70- projecting beyond one side of the frame plates and having a finger piece 71 secured to the outer end of'said arm, and having another arm 72 extending into a recess 73 in the latch bolt 31 with a rotative fit i I Each of the latch bolts 31 is in the form of a bar'of substantially rectangular cross-section and has a width in a direction parallel to the planes; of the frame. plates 55 and 56 slightly less than the widths of the openings 58 in said plates'so as to cause said latch bolt to slide in and corresponding holds the buckle parts against relative movement sideand 5. An olfset'in this wall 87' of the cover 82 forms a shoulder 88 seating, againstthe margin oft-he frame plate 55 to assure theformation of this'clearance when the cover 82 is pressed and crimped into position over said In the operation of the buckle 14,. when the buckle parts-12 and 13 are separated, the latch'bolts 31 will be and cam the latch bolts'outwardly against the action ofthe springs. 52', until the recesses 30behind-said catch teeth'26 register with said latch bolts, whereupon these latch bolts, under the'action of the springs, will snap into said recesses 39 and lock the: two buckle parts 12 and 13 together, as shown in FIG.-1. I

' In locked position of the buckle parts 12 and13'shown in FIG. 1, the, tooth 43'snugly fitting in the. recess 27,

v ways, and thetooth 43 serves as a compression member I or column, supporting the Ca'lICh',tC6 '[h. 26 against the bending stresses applied to said catch teeth 26by the latch bolts 31, as the two buckle parts, are pulled apart lengthwise of the buckle. As a'result,the locking stresses along the corresponding opening with a snug free slide fit' and has a depth in directions transverse to said planes greater than the'distance between the inner confronting faces of said platcs'and slightly smaller than the distance between the outer faces of said plates, to assure slide contact of said latch bolt with the sides 60 and 61 of the registering openings 53..

A projection '75 on each bell-"crank lever 53 constituting in effect a third arm of the lever, defines a shoulder against which the corresponding coil spring 52' bears.

The bell-crank 1evers 53 are normally urged by the inthe buckle 141in'the direction'to separate the buckle a parts 12mm 13 are'mostly in shear,- and the buckle, therefore, is able to-withstand more separating pull on the buckle, than would be possible, if the teeth 26 were not supported againstjedgewise bending.

' To release the buckle parts 12 and13, all that is necessary is to engage "the finger pieces 71 on the sides, of the buckle 14 projecting beyondthe covers82'and 83 with the thumb and forefinger and to draw these finger pieces springs 52in position in. which thelatch bolts 31 are oressedinwa'rdly against the bases of the openings 58, as shown in FIG. '1, and are operated by hand against the this position, as shown inF IG, 2; I y

from

to the left (F1651) along; the opposite sides of the buckle,

thereby turning the levers53 about the axes of their pivotal supports against the action of the springs 52. Since the levers, 5 3' are interconnected'by the slide, 76, the two levers must operate together, and the releasing operation "described rnoves the latchbolts 31 out of the recess v3t] In order to lock the two levers 53 together' for opera tion-in unison, there is provided a slide 76 in'the form or a U-shaped' stirrup, straddlingthe-frame plate 55'and] having short legs 77 extending into recesses 7 8 at the ends of the frame plate and provided with respective notches 8% to receive the arms of the levers 53' respectively.-

These plate recesses 78 are wider than the slide 76 to per mit the slide to move in response {to the manipulatioh pf 'the levers 53, along the buckle 14 The' slide 76 ;when

operated by a single lever 53 tilts relative'to'the. frame v plate 55 and jams thereon, thereby preventingsaid lever from completing 'its'releasing operation: 'Q By means of;-

simultaneously, 'therebyfreeingthe'catch teeth 26 for withdrawal from the buckle part*13, as shown'in FIG. 2. i

'1' The belt webs 1i) and 11 are. so connected to thejbuckle parts 12' and 13 respectively as to' permit the buckle 14- to remaincentered abo'ut the waist of the wearer in spite;

"of adjustments in the lengths of the webs and to permit;

the easy removal of the buckle parts from thewebs for removal, -repair or cleaning,'without destroying the Web's.v

Also, they buckle'parts 12 and13" are so constructed as to distributethe-tensional; stresses applied to the webs 10' randg ll crossfwise outwardly fromthe longitudinal center thereof to thesidefsythereof, therebyredueing thelikelihood.

of the webs being torn on the sides or edges due to a concentration of tensional stresses on these sides.

To permit easy removal of the webs and 1 1 from the buckle parts 12 and 13 and to permit adjustments in the effective lengths of the webs while maintaining the buckle 14 centered on the Wearers Waist, these webs are free from sewing attachment to the floor anchorage. For anchorage to the floor, there is screwed to the floor A (FIGS. 7 and 8) of the motor vehicle on opposite sides of the front seat somewhat rearwardly of the seat, or to the floor of an aircraft, or to any other point of securement, the two fittings 16, shown in the form of eyebolts, and attached to each end of the web 10 and 11 is the bracket 15. The bracket 15 is shown in the form of a fiat plate having a hook 95 at its lower end for engagement with the fitting 16 and having a pair of parallel slots 96 through and around which the web 10 or 11 may be looped and threaded, as shown in FIG. 8, to retain frictionally one end of the web anchored to the floor.

' The other end of each belt web 10 and 11 is releasably attached to the corresponding buckle parts 12 and 13. For effecting attachment of the web 10 to the buckle frame ring 20, said buckle frame ring carries a Web keeper 100 in the form of an angle bar having an outer flange 101 long enough to seat at its ends on the outer faces of the side bar pieces 23 and 2-4 and having a flange 102 passing through the opening of the ring and long enough to seat at its ends on the inner faces of the side bar pieces 23 and 24. The ends of the flange 102 are provided with notches 103 to receive the edges of the bar pieces 23 and 24 with a slide fit, and although the two flanges 101 and 102 are longer thanthe height of the opening 25 between the two bar pieces 23 and 24, the flange 102 is sufliciently shorter than the flange 101 to permit the keeper 100 to be slipped on and off into sliding interlock with the keeper by tilting the keeper in relation to the opening 25 so that it extends diagonally thereof and lifting the keeper from the opening.

The flanges 101 and 102 have an external interconnecting contour 104 over which the belt web 10 passes as it is looped over the keeper 100, as shown in FIG. 4. To afford a gripping surface along the curved contour 104 for the belt web 10, the surface along said contour is fluted or knurled lengthwise of the flanges 101 and 102.

The end portion of the belt web 10 is threaded through the opening 25 from the inner face of the buckle 14 which comes in contact with the wearers waist, passes over the outer face of the flange 101 of the keeper 100, is threaded through the section of the opening 25 between the keeper and the outer end bar piece 22 of the frame ring 20, so that said belt portion loops around said keeper, passes over the knurled surface 104 of the keeper, passes underneath and across the inner surface of the bar piece 22 and terminates in an outside belt end section 106 overlying the body section 107 of the belt. To hold this end section 106 of the web 10 against or close to the body section 107 of the web and in longitudinal alignment therewith, and to afford a rigid grip at the end of the belt web by which said web can be manipulated for belt web adjustment, there is provided a clip 108. This Clip 108 is in the form of a U-shaped bar having its ends 110 turned inwardly and secured to the end 111 of the belt web 10 by looping said web end around the ends 110 of the clip 108 and stitching at 112. The body section 107 of the belt web 10 is threaded through the clip 108 which is slidable along said body section.

As the belt web 10 is tensioned, the keeper 100 is moved by the tension of the web looped around the keeper towards the inner edge 113 of the outer end bar piece 1 22 of the frame ring 20. This tension transmitted to the sides of the belt Web 10 where said web passes through.

the opening 25 adjacent to the bar piece 22, tends to tear the web at these sides. Any pull on the web 10 in directions out of line with the longitudinal center line of the web will cause the web to be twisted, thereby concentrating tensional stresses on one or the other side of the web Where said web passes through the opening 25 and bears against the bar piece 22. This condition aggravates the tendency to tear the web 10 at these sides.

To distribute the stresses across the belt web 10 in the vicinity of the buckle 14 where it passes through the opening 25, and prevent thereby the destructive actions on the sides of the web described, there is provided a floating channel bar 115, straddled over the inner edge 113 of the bar piece 22. The bar 115 is just long enough to fit easily in the opening 25 between the side bar pieces 23 and 24 of the frame ring 20, with the ends of said bar contacting said bar pieces, so that said bar can slide along said opening, and has a channel 116 which is wide enough to straddle the inner edge 113 of the bar piece 22 with a snug slide fit along said bar pieces and which has a straight flat base 117. The inner edge 113 of the bar piece 22 slopes from its center 118 outwardly towards the ends of the bar piece, so that this center constitutes the peak of this edge and the channel bar 115 can bend,

symmetrically about said center when the web 10 is subjected to longitudinal load centralized along the longitudinal center of the web or can rock from side to side about this center when the load is angularly applied to the web. The side sections of the inner edge 113 on opposite sides of the center 118 may slope approximately 1 to produce the desirable effects to be described.

With the construction described, when the tension on the belt web 10 is centralized along the web, the force of this tension applied to the float bar 115 causes this bar to bend slightly symmetrically about the peak 118 of the bar piece edge 113, so that the greatest stretch on the web is applied along the longitudinal center of the belt, Where the web is best capable of withstanding the stress, causing this center of the web to thin out and the stress to be distributed outwardly cross-wise of the web from this center towards the side but at diminishing values. Under these conditions, the stress is least at the sides of the web 10, so that destructive stresses are kept away from these web sides.

In case the stresses are applied to the belt web 10 angularly, the floating bar 115 will tilt about the peak 118 of the inner edge 113 of the bar piece 22, so that the bar will assume a direction substantially at right angles to the longitudinal direction of the web in spite of the askewed pull on the web, thereby presenting a bearing surface for the web on the float bar at right angle to the direction of the load. This prevents the application of concentrated excessive stresses on the sides of the belt web 10 tending to tear the web on these sides.

The floating bar 115 serves not only as a stress distributor for the belt Web 10 as described, but also serves as a means for aiding the holding of the web against longitudinal displacement when subjected to stress. For that purpose, the back 120 of the bar 115 against which the web 10 rubs in its passage through the frame ring opening 25 is knurled, fluted or otherwise roughened to present a gripping surface for said web.

The belt web 11 is attached to the buckle frame ring 35 of the buckle part 13 by means similar to those de scribed for attaching the belt web 10 to the buckle frame ring 20 of the buckle part 12. For that purpose, there is provided a web keeper a similar to the web keeper 100 and similarly mounted on the buckle frame ring 35. Also, there is associated with the buckle frame ring 35 a floating bar a, similar in construction to the floating bar 115 associated with the buckle frame ring 20, and serving a similar function. A clip 108a similar to the clip 108 is attached to the end 111a of the belt web 11 and serves to hold the end section 106a of said Web 11 against the body section 107a of said web 11, in a manner indicated in connection with the clip 10S and the web 10.

The end portion of this web 11 is arranged with respect to the buckle frame ring 35, the keeper 100a, the floating bar 115a and the clip 108a in the manner described in connection with the end portionof the belt web 11.

With the arrangements of the belt webs and'11 with a a buckle parts together against separation, and hand-controllable means for releasing said latch means to permit 7 said buckle parts to'be separated, said hand-controllable of the buckle 14, the procedure shown'in FIG; 9 can be' followed.v For that purpose, assuming that it is desired to lengthen the web 11, the buckle part 1 3 is tilted in a plane substantially at right angles to the plane of the web and the body section 197a of the belt web is pulled, causing 1 the end section 106a of the web to become foreshortened.

To tighten the belt web 10, all that is necessary is to pull the end section 106a of the web 11,. as shown in FIG. 10 to lengthen said web section. Y

' By performing the necessary adjustments of both webs 10 and 11, it is possible to obtain the necessary belt tight 7 ness, while still retaining the buckle 14 in the center of.

the applicants waist.

' Also, it should be noted that since neither of the webs While the invention has been described with particular reference to: a specific embodiment, it' is to be understood that it is not to be liinitedthereto but is tobe construed broadly and restricted solely by the scope of the appended claims. g a

- What is claimedis: I

1. A safety belt buckle comprising a pair of separable buckle parts, one of said'buckle parts comprising a pair of catch teeth separated by an intervening recess, each of said teeth having a catch recess on'its outer side, the other buckle part comprising a pair of latch bolts slidable into and out of said catch recesses respectively when said buckle parts are together, said catch teeth being urged angularly edgewise towards 7 each other" by the bending action of the latch bolts thereon when in'locking position in said catch recesses upon the pulling of said buckle parts away from each' other in directions along thelengthof the buckle, spring means urging said latch bolts into said recesses respectively when said buckle parts are together and a support tooth having a shapeto fit said intervening recess snugly to mesh with said catch teeth and to support said teeth against said bending action when said buckle parts are locked together and when saidcatch teeth are subjected to stresses resulting from separating pull on said buckle parts, whereby said catch teeth are subjected mainly to shear stresses during such pull, said catch teeth and said support teeth being in relative position to intermesh, upon movement of said buckle parts relatively towards.

each other, and hand-controllable" means for moving'said latchbolts out of said catch recesses against theaction of said spring means to permit saidbuckle parts to be separated.

hand-controllable means comprising a pair of bell-crank means comprising apair of finger-piecesspaced on the buckle, and means for blocking the operation of said finger-pieces except upon; simultaneous operation of said finger-pieces, one of said buckle parts comprising a frame member, saidblocking means comprising a slide engaging bothof said finger-pieces and guided along said frame member, said slide being tiltably jammed against said frame member when operated by a single one of said finger-pieces and requiring the simultaneous operation of both of said finger-pieces :to cause said slide to move along said frame member. l

4. A safety beltbuckle comprising a pair of separable buckle parts, latch means automatically operable when said buckle parts are brought together forlocking said buckle parts together against separation, and hand-controllable means for releasing-said latch means to permit said buckle parts to be separated,.said hand-controllable means comprising a .pair of finger-pieces spaced on the buckle, and means for. blocking the operation of said finger-pieces except upon simultaneous operation of said finger-pieces, one of said buckle parts comprising a frame plate, said finger-pieces constituting respective arms of spring-pressed levers located near opposite sides of the buckleand pivotally supported on said frame plate, said blocking means comprising a slide .in the form ofa U shape stirrup'straddling the. frame plate and having legs provided with.respectiveopenings to receive said fingerpieces, said slide being tiltably jammed against said frame plate when operated by a single one of said finger-pieces and requiring-the. simultaneous operation of both of said finger-pieces to cause said slide to move along said frame plate.

. 5. A safety belt buckle comprising a pair. of separable buckle parts, one of said buckle parts being substantially flat and comprising a section at one end for attaching a belt web thereto and a pair of catch teeth at the other end be 'fitted into said intervening recess snugly into engagementiwith the inner sides of said catch teeth, a pair of flat frame plates rigidly secured to opposite outer faces of said support tooth to ,forma guidesocket for said catch teeth 'and'each having two openings, the openings in one frame plate registering withthe openings in the other frame plate, two latch bolts in the path: of said catch teeth as'the 2. A safety belt buckle as described 'in'claim 1,. said levers pivotally carried by the buckle part which .com-' 1 prises. said latch boltsyeach of said bell-crank leversi having one armextending laterally of said directions in an accessible position to serve as a finger-piece movable I along. said directions and having the otheiiarm pivotally secured to the corresponding latch bolt, whereby move ments ofsaid finger-pieces along one: of said 'directions "move said latch bolts out of said catch recesses, said spring means comprising a pair 'of springs acting on said bellcrank levers respectively, 7

3. A safety belt Ibuckle comprising a pair of se parable' buckle parts, latch means automatically operable when. said'buckle parts are brought together for locking said two buckle parts are moved relatively toward each other,

a each of said bolts being guided in a pair of corresponding registering: openings.v and being slidable therein into and out of the corresponding catch recess, when said buckle parts are brought together, two bell-crank leverslocated between .said frame plates andpivotallysupported on saidj'frame. plates,"each of'said bell-cranks having an arm extending beyondthe corresponding side of said frame bolt, a pair of springs supported in between said frame plates, each of saidsprings bearing at one end on a corresponding support rigid with said. frame plates and at the other end against the corresponding bell-crank to urge the corresponding latch bolt towards the corresponding catch recess whensaidbuckle parts are together, and cam means for moving said; latch bolts out of the paths of said catch teeth against 'theactions of said springs; as the two buckle parts are moved relatively towards each other until the'catchrecesses reach positions oppositesaid latch bolts, whereupon s aid lat'ch bolts snap into said catch recesses under the action'o'f lsaid, springs to lock'said buckle parts against separation! safety belt-buckleasdescribed in claim 5, comprising means for blocking the operation of said finger- 2,988,797 6/61 Gaylord 24-2301 pieces except upon simultaneous operation of said finger- 2,999, 88 9/61 Warner et a1 24-77 pieces, comprising a slide engaging both of said finger- 3,090,092 5/63 Zemplak et 211. pieces and guided along one of said frame plates. 3,118,208 1/64 Wexler 24230.1

5 FOREIGN PATENTS References Cited by the Examiner 210,304 9/57 Australia.

UNITED STATES PATENTS 96,026 9/22 Switzerland. 312,679 2/85 Wagner 24132 961,402 11/49 France. 4 7/53 Smith 24- 8 10 1,149,227 7/57 France. 2,847,748 8/58 Robinton 24- 1,162,639 4/58 France. 2,919,481 1/60 Finken et a1. 24-196 2,936,500 5/60 Eisner 24196 DONLEY J. STOCKING, Primary Examiner. 

1. A SAFETY BELT BUCKLE COMPRISING A AIR OF SEPERABLE BUCKLE PARTS, ONE OF SAID BUCKLE PARTS COMPRISING A PAIR OF CATCH TEETH SEPERATED BY AN INTERVENING RECESS, EACH OF SAID TEETH HAVING A CATCH RECESS ON ITS OUTER SIDE, THE OTHER BUCKLE PART COMPRISING A PAIR OF LATCH BOLTS SLIDABLE INTO AND OUT OF SAID CATCH RECESSES RESPECTIVELY WHEN SAID BUCKLE PART ARE TOGETHER, SAID CATCH TEETH BEING URGED ANGULARLY EDGEWISE TOWARDS EACH OTHER BY THE BENDING ACTION OF THE LATCH BOLTS THEREON WHEN IN LOCKING POSITION IN SAID CATCH RECESSES UPON THE PULLING OF SAID BUCKLE PARTS AWAY FROM EACH OTHER IN DIRECTIONS ALONG THE LENGTH OF THE BUCKLE, SPRING MEANS URGING SAID LATCH BOLTS INTO SAID RECESSES RESPECTIVELY WHEN SAID BUCKLE PARTS ARE TOGETHER AND A SUPPORT TOOTH HAVING A SHAPE TO FIT SAID INTERVIEWING RECESS SNUGLY TO MESH WITH SAID CATCH TEETH AND TO SUPPORT SAID TEETH AGAINST SAID BENDING ACTTION WHEN SAID BUCKLE PARTS ARE LOCKED TOGETHER AND WHEN SAID CATCH TEETH ARE SUBJECTED TO STRESSES RESULTING ROM SEPARATING PULL ON SAID BUCKLE PARTS, WHEREBY SAID CATCH TEETH ARE SUBJECTED MAINLY TO SHEAR STRESSES DURING SUCH PULL, SAID CATCH TEETH AND SAID SUPPORT TEETH BEING IN RELATIVE POSITION TO INTERMESH UPON MOVEMENT OF SAID BUCKLE PARTS RELATIVELY TOWARDS EACH OTHER, AND HAND-CONTROLLABLE MEANS FOR MOVING SAID LATCH BOLTS OUT OF SAID CATCH RECESSES AGAINST THE ACTION OF SAID SPRING MEANS TO PERMIT SAID BUCKLE PARTS TO BE SEPERATED. 